This is pretty simple, really. Early polls showed Spector 20+ points behind Pat Toomey, the guy who almost beat him in the primary back in 2004. Spector looked at his cards and decided it would be easier to win as a Dem in the generals then as a Repub in the primaries.
This is just political opportunism. It's not as though anyone believe Spector had a political-moral foundation to begin with.
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